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We present an improved version of the Wong formula for heavy-ion fusion,where the parameters of the parabolic approximation of the Coulomb barrier arereplaced by parameters of the l-dependent potential at an effectivepartial-wave. A pocket formula for this l-dependence is given. This versionreproduces the fusion cross sections of quantum mechanical calculations verywell, even when the original Wong formula is not valid. The same procedure isused to derive an improved expression for the classical fusion cross section,which is very accurate at above-barrier energies. Based on this classicalexpression, we propose a new method to reduce fusion data in this energy range.This method is used to perform a comparative study of complete fusionsuppression in collisions of weakly bound projectiles. This study indicatesthat the suppression of complete fusion is essentially due to the action ofnuclear breakup couplings.

Improved Wong and classical approximations, and reduction of fusion data